Calculation of the effective volume within the fire dike of the tank area
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Dear friends, how is the effective volume within the fire dike of a tank farm calculated? I’ve seen in some documents that it is stated that both the \"Construction Code\" and the \"Stone Construction Code\" require that the actual height (H) of a fire dike should be 0.2 m higher than the calculated height (Hj). In other words, the effective volume of a fire dike refers to the volume below 0.2 m from the top of the dike; that is, H = Hj + 0.2 (m). ”Is the effective volume of that fire dike the actual volume of 0.2m or less? Is the same calculation method used for dikes as well? Regarding the other \"actual volume of less than 0.2m\", in addition to deducting the volume of the tank foundation, is it also necessary to deduct the volume of the tank located below the fire dike? I would appreciate advice from my friends.
As I understand it, the fire dike is the same as yours; there’s no need to add 0.2 to the dike height, but it seems that the minimum height cannot be less than 0.6
3.2.7 The effective volume of the fire dike for oil tank groups shall be calculated using the following formula: V = AHj – (V1 + V2 + V3 + V4). Where: V – effective volume of the fire dike (m3)； A —— The horizontal projected area enclosed by the centerline of the fire dike (m2) ； Hj——Designed liquid level height (m) ； V1 — Volume (m3) of the foundation of a maximum oil tank above ground level within the designed liquid level height inside the fire dike ； V2 —— the sum of the volume of the oil tanks other than the largest one within the fire dike at the designed liquid level of the fire dike and the volume of the oil tank foundations exposed above the ground (m3) ； V3 —— Sum of the volume of the dike within the designed water level inside the dike’s centerline and the volume of the fill material inside it (m3) ； V4 —— The sum of the volumes of dike partitions, piping, equipment, and other structures within the designed liquid level height inside the fire dike (in m3).